When dealing with your face and perceptions (your own and those of your surgeon), always try a less invasive method first, before submitting yourself to permanent implants. In your case, you photograph as been very well taken to show the depressed temporal fossa: this occurs with natural aging and, in some instances, after surgery or certain diseases. Whereas a permanent implant should work well, far better to try one of the fillers and make sure you like the result. Most fillers in this area will last around 9 - 12 months. If you simply have familial or premature atrophy of the temporal tissues, further change may also occur over the next few years: worth considering if you are going to contemplate a permanent implant.Good luck!BCK Patel MD, FRCS